HAL815E datasheet(10/24 Pages) MICRONAS

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HAL 815

ADVANCE INFORMATION

Micronas

Step 2: Calculation of VOQ and Sensitivity

The calibration points 1 and 2 can be set inside the

specified range. The corresponding values for VOUT1

and VOUT2 result from the application requirements.

For highest accuracy of the sensor, calibration points

near the minimum and maximum input signal are rec-

ommended. The difference of the output voltage

between calibration point 1 and calibration point 2

should be more than 3.5 V.

Set the system to calibration point 1 and read the reg-

ister ADC-READOUT. The result is the value ADC-

READOUT1.

Now, set the system to calibration point 2, read the

ADC-READOUT2.

With these values and the target values VOUT1 and

VOUT2, for the calibration points 1 and 2, respectively,

the values for Sensitivity and VOQ are calculated as:

This calculation has to be done individually for each

sensor.

Next, write the calculated values for Sensitivity and

VOQ into the IC for adjusting the sensor.

The sensor is now calibrated for the customer applica-

tion. However, the programming can be changed again

and again if necessary.

Step 3: Locking the Sensor

The last step is activating the LOCK function with the

“LOCK” command. The sensor is now locked and does

not respond to any programming or reading com-

mands.

Warning: This register cannot be reset!

2.3.2. Calibration of the Angle Sensor

The following description explains the calibration pro-

cedure using an angle sensor as an example. The

required output characteristic is shown in Fig. 2–7.

– the angle range is from

−25° to 25°

– temperature coefficient of the magnet:

−500 ppm/K

Step 1: Input of the registers which need not be

adjusted individually

The register values for the following registers are given

for all applications:

–FILTER

Select the filter frequency: 500 Hz

–RANGE

Select the magnetic field range: 30 mT

–TC

For this magnetic material: 6

–TCSQ

For this magnetic material: 14

–CLAMP-LOW

For our example: 0.5 V

–CLAMP-HIGH

For our example: 4.5 V

Enter these values in the software, and use the “write

and store” command for permanently writing the val-

ues in the registers.

Low clamping voltage

≤ V

OUT1,2 ≤ High clamping voltage

VOUT1 − VOUT2

ADC-READOUT1

− ADC-READOUT2

Sensitivity =

VDD

2048

ADC-READOUT1 * Sensitivity * VDD

2048

VOQ = VOUT1 −

–30

–20

–10

Angle

VOUT

Clamp-high = 4.5 V

Clamp-low = 0.5 V

Calibration point 2

Calibration point 1

Fig. 2–7: Example for output characteristics

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